Health & WellnessMy dog still has fleas after Frontline. Can I reapply or switch?
It is safe to reapply the Frontline now, but in my experience, it doesn't have great flea protection. You may have better luck with Advantage products or a Seresto collar. The best flea protection is the prescription oral flea preventatives, like Bravecto or Nexgard.
Updated on September 24th, 2025